Dr Marshall is a nephrologist who trained in New Zealand and the United States. He is an epidemiologist and clinical trialist, and currently works in a public hospital, his local university and an Early Phase Clinical Trials unit. He has also spent considerable time in the dialysis device industry as a Director of Medical Affairs. He has a wide range of interests and is well published on the international stage in the areas of dialysis, critical care nephrology, and health service delivery.